plastic/src/external/java/org/apache/tapestry5/internal/plastic/asm/optimizer/ClassOptimizer.java - tapestry-5 - Git at Google

 /***
  * ASM: a very small and fast Java bytecode manipulation framework
  * Copyright (c) 2000-2011 INRIA, France Telecom
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  * 3. Neither the name of the copyright holders nor the names of its
  *    contributors may be used to endorse or promote products derived from
  *    this software without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  * THE POSSIBILITY OF SUCH DAMAGE.
  */
 package org.apache.tapestry5.internal.plastic.asm.optimizer;

 import java.util.ArrayList;
 import java.util.List;

 import org.apache.tapestry5.internal.plastic.asm.AnnotationVisitor;
 import org.apache.tapestry5.internal.plastic.asm.Attribute;
 import org.apache.tapestry5.internal.plastic.asm.ClassVisitor;
 import org.apache.tapestry5.internal.plastic.asm.FieldVisitor;
 import org.apache.tapestry5.internal.plastic.asm.Label;
 import org.apache.tapestry5.internal.plastic.asm.MethodVisitor;
 import org.apache.tapestry5.internal.plastic.asm.Opcodes;
 import org.apache.tapestry5.internal.plastic.asm.TypePath;
 import org.apache.tapestry5.internal.plastic.asm.commons.Remapper;
 import org.apache.tapestry5.internal.plastic.asm.commons.RemappingClassAdapter;

 /**
  * A {@link ClassVisitor} that renames fields and methods, and removes debug
  * info.
  *
  * @author Eric Bruneton
  * @author Eugene Kuleshov
  */
 public class ClassOptimizer extends RemappingClassAdapter {

     private String pkgName;
     String clsName;

     boolean isInterface = false;
     boolean hasClinitMethod = false;
     List<String> syntheticClassFields = new ArrayList<String>();

     public ClassOptimizer(final ClassVisitor cv, final Remapper remapper) {
         super(Opcodes.ASM5, cv, remapper);
     }

     FieldVisitor syntheticFieldVisitor(final int access, final String name,
             final String desc) {
         return super.visitField(access, name, desc, null, null);
     }

     // ------------------------------------------------------------------------
     // Overridden methods
     // ------------------------------------------------------------------------

     @Override
     public void visit(final int version, final int access, final String name,
             final String signature, final String superName,
             final String[] interfaces) {
         super.visit(Opcodes.V1_2, access, name, null, superName, interfaces);
         int index = name.lastIndexOf('/');
         if (index > 0) {
             pkgName = name.substring(0, index);
         } else {
             pkgName = "";
         }
         clsName = name;
         isInterface = (access & Opcodes.ACC_INTERFACE) != 0;
     }

     @Override
     public void visitSource(final String source, final String debug) {
         // remove debug info
     }

     @Override
     public void visitOuterClass(final String owner, final String name,
             final String desc) {
         // remove debug info
     }

     @Override
     public AnnotationVisitor visitAnnotation(final String desc,
             final boolean visible) {
         // remove annotations
         return null;
     }

     @Override
     public AnnotationVisitor visitTypeAnnotation(int typeRef,
             TypePath typePath, String desc, boolean visible) {
         // remove annotations
         return null;
     }

     @Override
     public void visitAttribute(final Attribute attr) {
         // remove non standard attributes
     }

     @Override
     public void visitInnerClass(final String name, final String outerName,
             final String innerName, final int access) {
         // remove debug info
     }

     @Override
     public FieldVisitor visitField(final int access, final String name,
             final String desc, final String signature, final Object value) {
         String s = remapper.mapFieldName(className, name, desc);
         if ("-".equals(s)) {
             return null;
         }
         if ((access & (Opcodes.ACC_PUBLIC | Opcodes.ACC_PROTECTED)) == 0) {
             if ((access & Opcodes.ACC_FINAL) != 0
                     && (access & Opcodes.ACC_STATIC) != 0 && desc.length() == 1) {
                 return null;
             }
             if ("org/objectweb/asm".equals(pkgName) && s.equals(name)) {
                 System.out.println("INFO: " + clsName + "." + s
                         + " could be renamed");
             }
             super.visitField(access, name, desc, null, value);
         } else {
             if (!s.equals(name)) {
                 throw new RuntimeException("The public or protected field "
                         + className + '.' + name + " must not be renamed.");
             }
             super.visitField(access, name, desc, null, value);
         }
         return null; // remove debug info
     }

     @Override
     public MethodVisitor visitMethod(final int access, final String name,
             final String desc, final String signature, final String[] exceptions) {
         String s = remapper.mapMethodName(className, name, desc);
         if ("-".equals(s)) {
             return null;
         }
         if (name.equals("<clinit>") && !isInterface) {
             hasClinitMethod = true;
             MethodVisitor mv = super.visitMethod(access, name, desc, null,
                     exceptions);
             return new MethodVisitor(Opcodes.ASM5, mv) {
                 @Override
                 public void visitCode() {
                     super.visitCode();
                     mv.visitMethodInsn(Opcodes.INVOKESTATIC, clsName,
                             "_clinit_", "()V", false);
                 }
             };
         }

         if ((access & (Opcodes.ACC_PUBLIC | Opcodes.ACC_PROTECTED)) == 0) {
             if ("org/objectweb/asm".equals(pkgName) && !name.startsWith("<")
                     && s.equals(name)) {
                 System.out.println("INFO: " + clsName + "." + s
                         + " could be renamed");
             }
             return super.visitMethod(access, name, desc, null, exceptions);
         } else {
             if (!s.equals(name)) {
                 throw new RuntimeException("The public or protected method "
                         + className + '.' + name + desc
                         + " must not be renamed.");
             }
             return super.visitMethod(access, name, desc, null, exceptions);
         }
     }

     @Override
     protected MethodVisitor createRemappingMethodAdapter(int access,
             String newDesc, MethodVisitor mv) {
         return new MethodOptimizer(this, access, newDesc, mv, remapper);
     }

     @Override
     public void visitEnd() {
         if (syntheticClassFields.isEmpty()) {
             if (hasClinitMethod) {
                 MethodVisitor mv = cv.visitMethod(Opcodes.ACC_STATIC
                         | Opcodes.ACC_SYNTHETIC, "_clinit_", "()V", null, null);
                 mv.visitCode();
                 mv.visitInsn(Opcodes.RETURN);
                 mv.visitMaxs(0, 0);
                 mv.visitEnd();
             }
         } else {
             MethodVisitor mv = cv.visitMethod(Opcodes.ACC_STATIC
                     | Opcodes.ACC_SYNTHETIC, "class$",
                     "(Ljava/lang/String;)Ljava/lang/Class;", null, null);
             mv.visitCode();
             Label l0 = new Label();
             Label l1 = new Label();
             Label l2 = new Label();
             mv.visitTryCatchBlock(l0, l1, l2,
                     "java/lang/ClassNotFoundException");
             mv.visitLabel(l0);
             mv.visitVarInsn(Opcodes.ALOAD, 0);
             mv.visitMethodInsn(Opcodes.INVOKESTATIC, "java/lang/Class",
                     "forName", "(Ljava/lang/String;)Ljava/lang/Class;", false);
             mv.visitLabel(l1);
             mv.visitInsn(Opcodes.ARETURN);
             mv.visitLabel(l2);
             mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL,
                     "java/lang/ClassNotFoundException", "getMessage",
                     "()Ljava/lang/String;", false);
             mv.visitVarInsn(Opcodes.ASTORE, 1);
             mv.visitTypeInsn(Opcodes.NEW, "java/lang/NoClassDefFoundError");
             mv.visitInsn(Opcodes.DUP);
             mv.visitVarInsn(Opcodes.ALOAD, 1);
             mv.visitMethodInsn(Opcodes.INVOKESPECIAL,
                     "java/lang/NoClassDefFoundError", "<init>",
                     "(Ljava/lang/String;)V", false);
             mv.visitInsn(Opcodes.ATHROW);
             mv.visitMaxs(3, 2);
             mv.visitEnd();

             if (hasClinitMethod) {
                 mv = cv.visitMethod(Opcodes.ACC_STATIC | Opcodes.ACC_PRIVATE,
                         "_clinit_", "()V", null, null);
             } else {
                 mv = cv.visitMethod(Opcodes.ACC_STATIC, "<clinit>", "()V",
                         null, null);
             }
             for (String ldcName : syntheticClassFields) {
                 String fieldName = "class$" + ldcName.replace('/', '$');
                 mv.visitLdcInsn(ldcName.replace('/', '.'));
                 mv.visitMethodInsn(Opcodes.INVOKESTATIC, clsName, "class$",
                         "(Ljava/lang/String;)Ljava/lang/Class;", false);
                 mv.visitFieldInsn(Opcodes.PUTSTATIC, clsName, fieldName,
                         "Ljava/lang/Class;");
             }
             mv.visitInsn(Opcodes.RETURN);
             mv.visitMaxs(1, 0);
             mv.visitEnd();
         }
         super.visitEnd();
     }
 }
	/***
	* ASM: a very small and fast Java bytecode manipulation framework
	* Copyright (c) 2000-2011 INRIA, France Telecom
	* All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions
	* are met:
	* 1. Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	* 2. Redistributions in binary form must reproduce the above copyright
	* notice, this list of conditions and the following disclaimer in the
	* documentation and/or other materials provided with the distribution.
	* 3. Neither the name of the copyright holders nor the names of its
	* contributors may be used to endorse or promote products derived from
	* this software without specific prior written permission.
	*
	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
	* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
	* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
	* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
	* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
	* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
	* THE POSSIBILITY OF SUCH DAMAGE.
	*/
	package org.apache.tapestry5.internal.plastic.asm.optimizer;

	import java.util.ArrayList;
	import java.util.List;

	import org.apache.tapestry5.internal.plastic.asm.AnnotationVisitor;
	import org.apache.tapestry5.internal.plastic.asm.Attribute;
	import org.apache.tapestry5.internal.plastic.asm.ClassVisitor;
	import org.apache.tapestry5.internal.plastic.asm.FieldVisitor;
	import org.apache.tapestry5.internal.plastic.asm.Label;
	import org.apache.tapestry5.internal.plastic.asm.MethodVisitor;
	import org.apache.tapestry5.internal.plastic.asm.Opcodes;
	import org.apache.tapestry5.internal.plastic.asm.TypePath;
	import org.apache.tapestry5.internal.plastic.asm.commons.Remapper;
	import org.apache.tapestry5.internal.plastic.asm.commons.RemappingClassAdapter;

	/**
	* A {@link ClassVisitor} that renames fields and methods, and removes debug
	* info.
	*
	* @author Eric Bruneton
	* @author Eugene Kuleshov
	*/
	public class ClassOptimizer extends RemappingClassAdapter {

	private String pkgName;
	String clsName;

	boolean isInterface = false;
	boolean hasClinitMethod = false;
	List<String> syntheticClassFields = new ArrayList<String>();

	public ClassOptimizer(final ClassVisitor cv, final Remapper remapper) {
	super(Opcodes.ASM5, cv, remapper);
	}

	FieldVisitor syntheticFieldVisitor(final int access, final String name,
	final String desc) {
	return super.visitField(access, name, desc, null, null);
	}

	// ------------------------------------------------------------------------
	// Overridden methods
	// ------------------------------------------------------------------------

	@Override
	public void visit(final int version, final int access, final String name,
	final String signature, final String superName,
	final String[] interfaces) {
	super.visit(Opcodes.V1_2, access, name, null, superName, interfaces);
	int index = name.lastIndexOf('/');
	if (index > 0) {
	pkgName = name.substring(0, index);
	} else {
	pkgName = "";
	}
	clsName = name;
	isInterface = (access & Opcodes.ACC_INTERFACE) != 0;
	}

	@Override
	public void visitSource(final String source, final String debug) {
	// remove debug info
	}

	@Override
	public void visitOuterClass(final String owner, final String name,
	final String desc) {
	// remove debug info
	}

	@Override
	public AnnotationVisitor visitAnnotation(final String desc,
	final boolean visible) {
	// remove annotations
	return null;
	}

	@Override
	public AnnotationVisitor visitTypeAnnotation(int typeRef,
	TypePath typePath, String desc, boolean visible) {
	// remove annotations
	return null;
	}

	@Override
	public void visitAttribute(final Attribute attr) {
	// remove non standard attributes
	}

	@Override
	public void visitInnerClass(final String name, final String outerName,
	final String innerName, final int access) {
	// remove debug info
	}

	@Override
	public FieldVisitor visitField(final int access, final String name,
	final String desc, final String signature, final Object value) {
	String s = remapper.mapFieldName(className, name, desc);
	if ("-".equals(s)) {
	return null;
	}
	if ((access & (Opcodes.ACC_PUBLIC \| Opcodes.ACC_PROTECTED)) == 0) {
	if ((access & Opcodes.ACC_FINAL) != 0
	&& (access & Opcodes.ACC_STATIC) != 0 && desc.length() == 1) {
	return null;
	}
	if ("org/objectweb/asm".equals(pkgName) && s.equals(name)) {
	System.out.println("INFO: " + clsName + "." + s
	+ " could be renamed");
	}
	super.visitField(access, name, desc, null, value);
	} else {
	if (!s.equals(name)) {
	throw new RuntimeException("The public or protected field "
	+ className + '.' + name + " must not be renamed.");
	}
	super.visitField(access, name, desc, null, value);
	}
	return null; // remove debug info
	}

	@Override
	public MethodVisitor visitMethod(final int access, final String name,
	final String desc, final String signature, final String[] exceptions) {
	String s = remapper.mapMethodName(className, name, desc);
	if ("-".equals(s)) {
	return null;
	}
	if (name.equals("<clinit>") && !isInterface) {
	hasClinitMethod = true;
	MethodVisitor mv = super.visitMethod(access, name, desc, null,
	exceptions);
	return new MethodVisitor(Opcodes.ASM5, mv) {
	@Override
	public void visitCode() {
	super.visitCode();
	mv.visitMethodInsn(Opcodes.INVOKESTATIC, clsName,
	"_clinit_", "()V", false);
	}
	};
	}

	if ((access & (Opcodes.ACC_PUBLIC \| Opcodes.ACC_PROTECTED)) == 0) {
	if ("org/objectweb/asm".equals(pkgName) && !name.startsWith("<")
	&& s.equals(name)) {
	System.out.println("INFO: " + clsName + "." + s
	+ " could be renamed");
	}
	return super.visitMethod(access, name, desc, null, exceptions);
	} else {
	if (!s.equals(name)) {
	throw new RuntimeException("The public or protected method "
	+ className + '.' + name + desc
	+ " must not be renamed.");
	}
	return super.visitMethod(access, name, desc, null, exceptions);
	}
	}

	@Override
	protected MethodVisitor createRemappingMethodAdapter(int access,
	String newDesc, MethodVisitor mv) {
	return new MethodOptimizer(this, access, newDesc, mv, remapper);
	}

	@Override
	public void visitEnd() {
	if (syntheticClassFields.isEmpty()) {
	if (hasClinitMethod) {
	MethodVisitor mv = cv.visitMethod(Opcodes.ACC_STATIC
	\| Opcodes.ACC_SYNTHETIC, "_clinit_", "()V", null, null);
	mv.visitCode();
	mv.visitInsn(Opcodes.RETURN);
	mv.visitMaxs(0, 0);
	mv.visitEnd();
	}
	} else {
	MethodVisitor mv = cv.visitMethod(Opcodes.ACC_STATIC
	\| Opcodes.ACC_SYNTHETIC, "class$",
	"(Ljava/lang/String;)Ljava/lang/Class;", null, null);
	mv.visitCode();
	Label l0 = new Label();
	Label l1 = new Label();
	Label l2 = new Label();
	mv.visitTryCatchBlock(l0, l1, l2,
	"java/lang/ClassNotFoundException");
	mv.visitLabel(l0);
	mv.visitVarInsn(Opcodes.ALOAD, 0);
	mv.visitMethodInsn(Opcodes.INVOKESTATIC, "java/lang/Class",
	"forName", "(Ljava/lang/String;)Ljava/lang/Class;", false);
	mv.visitLabel(l1);
	mv.visitInsn(Opcodes.ARETURN);
	mv.visitLabel(l2);
	mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL,
	"java/lang/ClassNotFoundException", "getMessage",
	"()Ljava/lang/String;", false);
	mv.visitVarInsn(Opcodes.ASTORE, 1);
	mv.visitTypeInsn(Opcodes.NEW, "java/lang/NoClassDefFoundError");
	mv.visitInsn(Opcodes.DUP);
	mv.visitVarInsn(Opcodes.ALOAD, 1);
	mv.visitMethodInsn(Opcodes.INVOKESPECIAL,
	"java/lang/NoClassDefFoundError", "<init>",
	"(Ljava/lang/String;)V", false);
	mv.visitInsn(Opcodes.ATHROW);
	mv.visitMaxs(3, 2);
	mv.visitEnd();

	if (hasClinitMethod) {
	mv = cv.visitMethod(Opcodes.ACC_STATIC \| Opcodes.ACC_PRIVATE,
	"_clinit_", "()V", null, null);
	} else {
	mv = cv.visitMethod(Opcodes.ACC_STATIC, "<clinit>", "()V",
	null, null);
	}
	for (String ldcName : syntheticClassFields) {
	String fieldName = "class$" + ldcName.replace('/', '$');
	mv.visitLdcInsn(ldcName.replace('/', '.'));
	mv.visitMethodInsn(Opcodes.INVOKESTATIC, clsName, "class$",
	"(Ljava/lang/String;)Ljava/lang/Class;", false);
	mv.visitFieldInsn(Opcodes.PUTSTATIC, clsName, fieldName,
	"Ljava/lang/Class;");
	}
	mv.visitInsn(Opcodes.RETURN);
	mv.visitMaxs(1, 0);
	mv.visitEnd();
	}
	super.visitEnd();
	}
	}